{"id":17224,"date":"2024-03-19T14:49:42","date_gmt":"2024-03-19T06:49:42","guid":{"rendered":"https:\/\/firstmold.com\/?post_type=case-study&#038;p=17224"},"modified":"2026-03-30T11:57:33","modified_gmt":"2026-03-30T03:57:33","slug":"lint-remover-parts-production-by-injection-molding-process","status":"publish","type":"case-study","link":"https:\/\/firstmold.com\/pt\/case-study\/lint-remover-parts-production-by-injection-molding-process\/","title":{"rendered":"M\u00e1quina de barbear para tecidos \/ Tira-fiapos - Fabrico de cabos"},"content":{"rendered":"<p id=\"h-\">Alguns tecidos utilizados no vestu\u00e1rio, nos estofos e nos cobertores s\u00e3o propensos a acumular penugem, p\u00ealos e fiapos, o que pode enfraquecer o seu aspeto. As m\u00e1quinas de barbear ou os removedores de cot\u00e3o s\u00e3o utilizados para dar a estes tecidos um aspeto novo. Os removedores de cot\u00e3o podem ser el\u00e9ctricos ou manuais. A vers\u00e3o el\u00e9ctrica utiliza l\u00e2minas rotativas protegidas por uma rede em forma de favo de mel para cortar com seguran\u00e7a os fiapos de tecido sem causar danos ao material. A vers\u00e3o manual utiliza um rolo de papel adesivo para apanhar os p\u00ealos e o p\u00f3. Nesta vers\u00e3o, a folha deve ser substitu\u00edda quando a superf\u00edcie estiver cheia.<\/p>\n\n\n\n<p>Um design cuidadoso do molde da pega do removedor de cot\u00e3o \u00e9 importante para promover a utiliza\u00e7\u00e3o segura, eficiente e confort\u00e1vel destes produtos. Quando uma pega de removedor de cot\u00e3o \u00e9 desconfort\u00e1vel de segurar, torna-se mais dif\u00edcil utilizar o produto para tarefas extensas de remo\u00e7\u00e3o de cot\u00e3o, como limpar cobertores grandes, casacos de inverno e estofos cobertos por animais de estima\u00e7\u00e3o. As fun\u00e7\u00f5es da pega do removedor de cot\u00e3o incluem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Melhorar a precis\u00e3o e o controlo:<\/em><\/strong> Um punho antiderrapante permite uma press\u00e3o precisa e consistente, para uma remo\u00e7\u00e3o segura dos cot\u00f5es sem danificar o tecido.<\/li>\n\n\n\n<li><strong><em>Reduzir a fadiga das m\u00e3os:<\/em><\/strong> O fabrico de um cabo de remo\u00e7\u00e3o de cot\u00e3o que privilegia as formas ergon\u00f3micas permite uma utiliza\u00e7\u00e3o confort\u00e1vel e prolongada.<\/li>\n\n\n\n<li><strong><em>Manobrabilidade melhorada:<\/em><\/strong> Os produtos com pegas girat\u00f3rias ou alargadas facilitam o acesso a \u00e1reas dif\u00edceis, como colarinhos ou cantos de estofos.<\/li>\n\n\n\n<li><strong><em>Utiliza\u00e7\u00e3o segura de produtos el\u00e9ctricos:<\/em><\/strong> Os componentes el\u00e9ctricos est\u00e3o cobertos com pegas de pl\u00e1stico para reduzir o risco de eletrocuss\u00e3o.<\/li>\n<\/ul>\n\n\n\n<p>As pegas dos removedores de cot\u00e3o tamb\u00e9m podem ser concebidas para um fim espec\u00edfico. Por exemplo, os modelos port\u00e1teis concebidos para utiliza\u00e7\u00e3o em movimento t\u00eam pegas curtas ou compactas, enquanto os modelos concebidos para tarefas dom\u00e9sticas pesadas t\u00eam pegas longas e robustas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-client-requirements\">Requisitos do cliente<\/h2>\n\n\n\n<p>Um fabricante de removedores de cot\u00e3o contactou a First Mold com um projeto da pega para o seu pr\u00f3ximo produto. Solicitou especificamente dois conjuntos de moldes multi-cavidades. O cliente preferiu a poliamida 66 refor\u00e7ada com fibra de vidro 30% (PA66 + 30% GF) como material principal para a moldagem por inje\u00e7\u00e3o da pega do removedor de cot\u00e3o.<\/p>\n\n\n\n<p>A escolha do material baseou-se nos problemas de durabilidade registados nos punhos dos seus modelos anteriores. O PA66 + 30% GF \u00e9 amplamente utilizado como alternativa ao metal em ambientes exigentes e de elevado stress. Tem uma resist\u00eancia mec\u00e2nica e rigidez superiores. O refor\u00e7o de fibra de vidro 30% aumenta a resist\u00eancia \u00e0 tra\u00e7\u00e3o at\u00e9 150% em compara\u00e7\u00e3o com a PA66 sem enchimento.<\/p>\n\n\n\n<p>O cliente solicitou uma precis\u00e3o dimensional apertada (\u00b10,1mm) que permitir\u00e1 uma montagem de encaixe. Al\u00e9m disso, o molde da pega do removedor de cot\u00e3o deve ter uma taxa de rendimento de produ\u00e7\u00e3o em massa \u226598%. Por outras palavras, deve ser adequado para a cria\u00e7\u00e3o de lotes repetidos de produtos sem os defeitos comuns da moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-challenges-and-solution\">Desafios e solu\u00e7\u00f5es<\/h2>\n\n\n\n<p>A escolha do material para a pega do removedor de cot\u00e3o por parte do fabricante representou um desafio significativo que a equipa de engenheiros da First Mold teve de ultrapassar. Embora o PA66 + 30% GF seja mais resistente e mais dur\u00e1vel do que os pl\u00e1sticos normais, o que deveria tornar a pega do removedor de cot\u00e3o mais dur\u00e1vel, apresenta um desafio de moldagem \u00fanico.<\/p>\n\n\n\n<p>Por exemplo, o conte\u00fado de fibra de vidro 30% do material actua como uma lixa durante a moldagem por inje\u00e7\u00e3o do cabo do removedor de cot\u00e3o. Consequentemente, ir\u00e1 desgastar os parafusos, os barris e reduzir a vida \u00fatil do molde (forma\u00e7\u00e3o de flash). Embora a utiliza\u00e7\u00e3o de a\u00e7o endurecido (por exemplo, H13\/1.2344) possa evitar a forma\u00e7\u00e3o de fulgor, ir\u00e1 aumentar o custo das ferramentas. Neste caso, isso significa aumentar o custo para al\u00e9m do or\u00e7amento do cliente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-preventing-glass-fiber-blooming\">Preven\u00e7\u00e3o da flora\u00e7\u00e3o da fibra de vidro<\/h3>\n\n\n\n<p>PA66 + 30% GF \u00e9 altamente propenso a florescer a fibra de vidro. Isto ocorre normalmente devido \u00e0 exposi\u00e7\u00e3o \u00e0 luz ultravioleta (UV) e \u00e0 humidade. Estes elementos corroem a camada de resina protetora do cabo do removedor de cot\u00e3o de fibra de vidro, expondo as fibras de vidro subjacentes. O resultado \u00e9 um aspeto gessado, felpudo e branco que \u00e9 esteticamente desagrad\u00e1vel. Este defeito \u00e9 inaceit\u00e1vel em electrodom\u00e9sticos.<\/p>\n\n\n\n<p>Para al\u00e9m do aspeto desagrad\u00e1vel, a superf\u00edcie pode parecer \u00e1spera. Al\u00e9m disso, as fibras soltas podem ser desconfort\u00e1veis ao toque ou dar origem a superf\u00edcies com \u201ccomich\u00e3o\u201d. A flora\u00e7\u00e3o avan\u00e7ada pode levar \u00e0 diminui\u00e7\u00e3o da integridade estrutural e ao aumento da porosidade. Esta \u00faltima permite a passagem de humidade atrav\u00e9s do cabo e danifica o delicado componente eletr\u00f3nico que se encontra por baixo.<\/p>\n\n\n\n<p>Os engenheiros da First Mold criaram um processo especializado para o fabrico de pegas de removedor de cot\u00e3o PA66 + 30% GF para eliminar completamente a flora\u00e7\u00e3o da fibra de vidro. O resultado foi uma superf\u00edcie lisa sem exposi\u00e7\u00e3o de fibras, cumprindo os padr\u00f5es de apar\u00eancia dos electrodom\u00e9sticos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-dimensional-inconsistency-in-multi-cavity-molds\">Inconsist\u00eancia dimensional em moldes multi-cavidades<\/h3>\n\n\n\n<p>Um molde de m\u00faltiplas cavidades tem a vantagem de permitir aos fabricantes criar mais pe\u00e7as num s\u00f3 ciclo. No entanto, apresenta desafios de processo que, se n\u00e3o forem corretamente tratados, podem levar a um aumento da produ\u00e7\u00e3o de pe\u00e7as defeituosas. O encolhimento desigual entre diferentes cavidades causa um aperto de encaixe inconsistente.<\/p>\n\n\n\n<p>Por exemplo, o molde do cabo do removedor de cot\u00e3o deve ser concebido para garantir um enchimento uniforme da cavidade, um controlo t\u00e9rmico consistente e uma qualidade uniforme da pe\u00e7a em todas as cavidades. No entanto, garantir um enchimento igual e simult\u00e2neo de todas as cavidades \u00e9 muitas vezes dif\u00edcil de conseguir.<\/p>\n\n\n\n<p>Da mesma forma, manter uma temperatura consistente em v\u00e1rias cavidades \u00e9 um desafio. O mais pequeno dos erros de c\u00e1lculo pode causar um fluxo desigual ou um arrefecimento diferencial, o que conduzir\u00e1 a defeitos como flash, disparos curtos, deforma\u00e7\u00e3o e diferen\u00e7as na contra\u00e7\u00e3o ou peso da pe\u00e7a.<\/p>\n\n\n\n<p>Tirando partido de d\u00e9cadas de experi\u00eancia e de software avan\u00e7ado de maquina\u00e7\u00e3o e CAD, a First Mold conseguiu resolver este problema. Com o equil\u00edbrio do rotor e o arrefecimento equilibrado, a equipa manteve a diferen\u00e7a dimensional entre cavidades em \u2264 0,03 mm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-maintaining-a-production-yield-rate-98\">Manuten\u00e7\u00e3o de uma taxa de rendimento da produ\u00e7\u00e3o \u226598%<\/h3>\n\n\n\n<p>O enchimento desequilibrado da massa fundida provoca cavidades demasiado compactadas ou de curta dura\u00e7\u00e3o, levando a uma queda acentuada do rendimento. Os engenheiros da First Mold enfrentaram outro desafio \u00fanico com este projeto. A forma \u00fanica do design da pega do removedor de cot\u00e3o tornava-o propenso a empenos e deforma\u00e7\u00f5es f\u00e1ceis.<\/p>\n\n\n\n<p>Se estas quest\u00f5es n\u00e3o forem resolvidas, podem levar a um desalinhamento da montagem, fivelas soltas e ru\u00eddo anormal no produto final. Outra preocupa\u00e7\u00e3o relacionada com a conce\u00e7\u00e3o da pega foi a fraca resist\u00eancia da linha de soldadura. A \u00e1rea de tens\u00e3o do punho \u00e9 suscet\u00edvel de se partir, representando um risco potencial para a seguran\u00e7a.<\/p>\n\n\n\n<p>Os engenheiros da First Mold resolveram estes problemas atrav\u00e9s da otimiza\u00e7\u00e3o do processo de ferramentas. Os desafios da deforma\u00e7\u00e3o e da fraca resist\u00eancia da linha de soldadura podem ser resolvidos atrav\u00e9s de ferramentas de precis\u00e3o e da otimiza\u00e7\u00e3o da temperatura.<\/p>\n\n\n\n<p>Durante o fabrico de ferramentas de precis\u00e3o para o molde da pega do removedor de cot\u00e3o, a equipa utilizou a maquina\u00e7\u00e3o CNC para obter uma espessura de parede uniforme nas diferentes cavidades do molde. Al\u00e9m disso, a equipa de produ\u00e7\u00e3o utilizou raios arredondados e consistentes nos cantos, em vez de arestas vivas, para ajudar o fluxo do material fundido. Outras medidas adoptadas para manter o rendimento acima de 98% incluem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Otimiza\u00e7\u00e3o da press\u00e3o:<\/em><\/strong> Press\u00e3o de enchimento, velocidade de inje\u00e7\u00e3o e press\u00e3o de reten\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong><em>Otimiza\u00e7\u00e3o da temperatura:<\/em><\/strong> Arrefecimento do molde, temperatura de fus\u00e3o e temperatura do molde.<\/li>\n\n\n\n<li><strong><em>Melhorar a conce\u00e7\u00e3o do molde:<\/em><\/strong> O port\u00e3o foi deslocado para garantir que a linha de soldadura ocorre numa \u00e1rea n\u00e3o cr\u00edtica. Foram adicionados respiradouros na linha de soldadura para permitir a sa\u00edda do g\u00e1s retido.<\/li>\n<\/ul>\n\n\n\n<p>Foi utilizado software de simula\u00e7\u00e3o para prever o empeno, a orienta\u00e7\u00e3o das fibras e a efici\u00eancia do arrefecimento antes de cortar o a\u00e7o para o molde. A combina\u00e7\u00e3o destas estrat\u00e9gias ajudou a First Mold a criar um molde para o fabrico de pegas para remo\u00e7\u00e3o de cot\u00e3o que controlava o empeno a \u2264 0,1 mm, garantindo a compatibilidade do 100% com o conjunto da unidade principal. As modifica\u00e7\u00f5es de design e a otimiza\u00e7\u00e3o do processo ajudaram a criar uma produ\u00e7\u00e3o em massa est\u00e1vel com deforma\u00e7\u00e3o zero.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-the-client-gained-with-first-mold-s-solutions\">O que o cliente ganhou com as solu\u00e7\u00f5es da First Mold<\/h2>\n\n\n\n<p>Ao trabalhar com a First Mold, o fabricante de removedores de cot\u00e3o conseguiu poupar tempo e dinheiro. Em primeiro lugar, tratava-se de um projeto com um prazo rigoroso. O cliente corria um enorme risco de corte de financiamento se n\u00e3o conseguisse entregar os produtos acabados no prazo de oito semanas a contar do primeiro contacto.<\/p>\n\n\n\n<p>Tirando partido de ferramentas avan\u00e7adas e trabalhando em estreita colabora\u00e7\u00e3o com o cliente, a First Mold entregou os dois conjuntos de moldes multi-cavidades em tr\u00eas semanas. Isto deu ao fabricante tempo suficiente para otimizar o seu processo de moldagem por inje\u00e7\u00e3o do cabo do removedor de cot\u00e3o antes de iniciar a produ\u00e7\u00e3o em massa.<\/p>\n\n\n\n<p>Devido \u00e0 natureza abrasiva do PA66 + 30% GF, o fabricante de removedores de cot\u00e3o enfrentou o risco de utilizar a\u00e7o endurecido para as ferramentas. Para al\u00e9m de ser mais dispendioso, este material requer uma m\u00e3o de obra mais intensa para a sua utiliza\u00e7\u00e3o. A combina\u00e7\u00e3o destes factores fez com que o custo das ferramentas ultrapassasse o or\u00e7amento do cliente. &nbsp;<\/p>\n\n\n\n<p>Os engenheiros da First Mold optimizaram o processo de fabrico de ferramentas de um a\u00e7o mais acess\u00edvel para criar uma barreira duradoura, dura e de baixa fric\u00e7\u00e3o entre as fibras abrasivas e a superf\u00edcie do molde. Por outras palavras, o molde do cabo de remo\u00e7\u00e3o de cot\u00e3o entregue ao cliente pode ser utilizado com seguran\u00e7a com PA66 + 30% GF sem sofrer degrada\u00e7\u00e3o prematura.<\/p>\n\n\n\n<p>Um molde com v\u00e1rias cavidades \u00e9 mais dif\u00edcil de otimizar, o que pode afetar a sua efici\u00eancia e rendimento. A First Mold criou uma documenta\u00e7\u00e3o detalhada para o cliente que o ajudaria na otimiza\u00e7\u00e3o do processo de moldagem por inje\u00e7\u00e3o do cabo do removedor de cot\u00e3o. A documenta\u00e7\u00e3o tamb\u00e9m inclui diretrizes sobre manuten\u00e7\u00e3o para garantir um menor tempo de inatividade.<\/p>\n\n\n\n<p>Tal como qualquer outro fabricante que tenha trabalhado com a First Mold, o fabricante de desincrustantes tamb\u00e9m beneficia de uma entrega r\u00e1pida de pe\u00e7as de substitui\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1774842489455\"><strong class=\"schema-faq-question\">Quais s\u00e3o os principais desafios dos moldes multi-cavidades?<\/strong> <p class=\"schema-faq-answer\">A dificuldade em equilibrar o fluxo de material, conseguir um arrefecimento e um controlo t\u00e9rmico uniformes, manter a consist\u00eancia da qualidade nas diferentes pe\u00e7as e os problemas de eje\u00e7\u00e3o s\u00e3o as principais desvantagens dos moldes com m\u00faltiplas cavidades. Se n\u00e3o forem optimizados, estes problemas podem levar a defeitos como disparos curtos e deforma\u00e7\u00f5es.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774842549403\"><strong class=\"schema-faq-question\">Quais s\u00e3o os desafios da utiliza\u00e7\u00e3o do PA66 + 30% GF para a moldagem por inje\u00e7\u00e3o do cabo do removedor de cot\u00e3o?<\/strong> <p class=\"schema-faq-answer\">O elevado desgaste da ferramenta, os defeitos de superf\u00edcie, a fluidez reduzida ou o enchimento do molde, a temperatura de processamento elevada e o risco acrescido de empeno s\u00e3o alguns dos desafios que os fabricantes que utilizam este material t\u00eam de ultrapassar.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Conhe\u00e7a um estudo de caso sobre como uma f\u00e1brica de moldagem por inje\u00e7\u00e3o produz pe\u00e7as de remo\u00e7\u00e3o de cot\u00e3o de alta qualidade atrav\u00e9s de moldagem por inje\u00e7\u00e3o de precis\u00e3o.<\/p>","protected":false},"author":2,"featured_media":17240,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"case-study-category":[66],"case-study-tag":[78],"class_list":["post-17224","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","case-study-category-injection-molding-cases","case-study-tag-tools-and-equipment"],"acf":{"photo_gallery":{"case_study_gallery":[[{"id":17240,"title":"manufactured lint remover component","caption":"manufactured lint remover component","full_image_url":"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/manufactured-lint-remover-component.webp","thumbnail_image_url":"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/manufactured-lint-remover-component-150x150.webp","large_srcset":"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/manufactured-lint-remover-component.webp 1000w, 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